Location Applinace problem

Just unboxed a brand new location Applinace and following the setup steps. when I get to where I have to configure the ifcfg-eth0 file I put in all the changes and try to save and I get a E212: Can't open file for writing error message. I can not get it to work on either interface, I have RW permissions on the file. Does anyone have any suggestions, I am not famillar with redhat so will need detailed instructions of the commands if so be.

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